The weapon that Rick uses in this episode is the M4 carbine.
Rick: (To Michonne) Hey, do you know Andrea?
Merle: Yep, she does. Her and blondie spent all winter cuddling up in the forest. Mm-mmm-mmm. Yeah. My Nubian queen here had two pet walkers. No arms, cut off the jaws, kept them in chains. Kind of ironic now that I think about it.
Tyreese: I must be the first brother in history to break into prison.
Axel: (chuckles) Makes me the first white boy that didn't want to break out.
Merle: Look at this. Pathetic! All these guns and no bullets in me?
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The Walker that attacks a person in Woodbury and is killed by Andrea was Greg Nicotero. Greg is the head of makeup effects on the show and this appearance made the second time Andrea killed him as a Walker. The first was as a Walker killing Andrea's sister in season one.
The scene where Rick and company are escaping Woodbury was taped on the west side of Senoia, GA. You can tell by the Seavy Street sign next to the bus they pass.
Original International Air Dates:
United Kingdom: February 15, 2013 on FOX/FOX HD
Finland: February 17, 2013 on FOX
Slovakia: March 21, 2013 on JOJ Plus
Sweden: April 7, 2013 on Kanal 11